astonblake said:Press and hold the power button on the top right corner of your iPhone or iPad until you see the shutdown screen. All iPhone, iPod Touch, and iPad power buttons are on the upper right corner (if youre facing the screen).
Now you should be seeing the shutdown screen below. Next step is to press and hold the home button. Keep holding it until frozen app closes and you see your home screen.
Your app is now closed, feel free to go about your business.